public class TestSt2 {
    public static void main(String[] args) {
        Student stu = new Student();
        stu.setStudentId("2025003");
        stu.setName("王五");
        stu.setAge(20); //合法年龄
        stu.setAge(15); //不合法年龄
        System.out.println("学生信息：" + stu.getStudentId() + ""
                            + stu.getName() + "" + stu.getAge() + "岁");
    }
}
